These modules where produced in 2003. And would be useful that someone could be able to update them and expand them.
What is worth to mention is the idea of building a standard UI for common dialogs. Not screens that require images and detailed text for long term use. But simple dialogs that you don't really care in what way they are shown, when you are in a hurry.
The point is standarizing the way of creating objects that would work the same, without Zenity in the system or with only an ASCII dialog box. You create the object the same, and you get the dialog box working with whatever the system has.